Moderate
Probable
Mô tả
Doxycycline may enhance warfarin's anticoagulant effect, particularly in patients whose vitamin K intake is already limited.
Cơ chế
Doxycycline reduces intestinal flora that produce vitamin K2, potentially decreasing cofactor availability for synthesis of clotting factors II, VII, IX, and X.
Ý nghĩa lâm sàng
INR elevations are typically modest but can be clinically relevant in elderly patients or those with dietary vitamin K insufficiency.
Xử trí
Monitor INR after starting doxycycline; counsel patients on consistent dietary vitamin K intake during antibiotic therapy.